Revenue - Contract Liability (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2018 |
Dec. 31, 2017 |
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| Contract with Customer, Liability [Roll Forward] | |||
| Beginning balance | $ 7,587 | ||
| Adjustments as a result of cumulative catch-up adjustment | (118) | ||
| Revenue recognized that was included in the contract liability balance at the beginning of the period | (6,480) | ||
| Increase due to cash received, excluding amounts recognized as revenue during the period | 7,557 | ||
| Ending balance | 8,546 | ||
| Deferred revenue | $ 7,430 | $ 6,508 | |
| Deferred revenue, non-current | 1,116 | 1,079 | |
| Deferred revenue | $ 7,587 | 8,546 | $ 7,587 |
| Remaining performance obligation | $ 1,000,000 | ||
| Percent of remaining performance obligation expected to be satisfied in 2019 | 25.00% | ||
| Percent of remaining performance obligation expected to be satisfied in 2020 | 17.00% | ||
| Percent of remaining performance obligation expected to be satisfied in 2021 | 15.00% |
| X | ||||||||||
- Definition Contract with Customer, Liability, Cash Received Net of Revenue Recognized No definition available.
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| X | ||||||||||
- Definition Contract with Customer, Liability, Cumulative Catch-up Adjustment to Revenue No definition available.
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| X | ||||||||||
- Definition Contract with Customer, Liability [Roll Forward] No definition available.
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| X | ||||||||||
- Definition Revenue, Remaining Performance Obligation, Expected Recognition, Next Twelve Months, Percent No definition available.
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| X | ||||||||||
- Definition Revenue, Remaining Performance Obligation, Expected Recognition, Years Two and Three, Percent No definition available.
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| X | ||||||||||
- Definition Revenue, Remaining Performance Obligation, Expected Recognition, Year Two, Percent No definition available.
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| X | ||||||||||
- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as noncurrent. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of transaction price allocated to performance obligation that has not been recognized as revenue. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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